In her forties Welsh poet Gwyneth Lewis decided to trade in her landlubber life - a nice house in Cardiff and a sensible job at the BBC - for life aboard a small yacht with her husband Leighton, a former bosun with the Merchant Navy and now in his mid-sixties. "We bought our first sailing boat by accident... She was a twenty-three-foot Intro class racer called Nitro, had a yellow hull and was totally unsuitable for beginners, so we bought...